Appeal No. 1999-0864 Page 6
Application No. 08/757,550
does not detect conditions external to the image display
device.” (Appeal Br. at 8.)
Claims 1, 3, 4, and 21 specify in pertinent part the
following limitations: “a circumstance detector for detecting
conditions external to the image display device under which a
user uses the image display device; and environmental image-
changing means for varying the environmental image according
to external conditions detected by said circumstance
detector.” Similarly, claims 12-14 and 20 specify in
pertinent part the following limitations: “a circumstance
detector for detecting a quantity or brightness of light of
the main image external to the environmental image under which
a user uses the image display device; and environmental image-
changing means for varying the environmental image according
to detected light quantity or brightness of the main image
detected by said circumstance detector.” Analogously, claims
15-19 specify in pertinent part the following limitations: “a
circumstance detector for detecting a sound volume or sound of
the display device under which a user uses the image display
device; and environmental image-changing means for varying the
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